134 Reviews— The Progress of Paleontology— 
The result may be summarised in the following table, in which the 
rock formations are arranged in the descending or der of stratification :— 
Number Number of Number of species 
Rock Formations. of species. sq. miles. per sq. mile. 
. Alluvium ... ue eee 302 Aas 22-1 wits 13°66 
. Gravel 383 ae Goby Ae 63°84... 10°26 
Bagshot Beds OS: fe 513 ae 93784 ee Oa Ties 
London Clay i me 4 6, Begs, LUSRQ Ti ltd en es Sn 
- Woolwich and Reading aoe 214 ee DBE coo 9-0 
Thanet Beds -. ... ««: ... «-- 204 aes 4°33... 47-1 
Chalk $06 » 623- soe on LIES oo 4°39 
Upper Greensand and Gault, 356 Seon eahoey ee 22°65 
Lower Greensand ... 711 ... - 149°6 4°75 
Weald Clay... g06 eee 364 ... + 165°4 2:21 
Hastings Beds He ies 281 ae 11°4 ee 24°65 
REVIHWwWS. 
I.—Tur Progress of PaLaonroLoey. 
PatmonToGRAPHIcAL Socrery, Vor. LX. Issued for 1906 (December, 
1906). Printed for the Society (agents, Messrs. Dulau & Co.). 
4to. Containing :— 
1. The Pleistocene Bears, Vol. II, Part 2; by Prof. 8. H. Reynolds, 
M.A., F.G.S. pp. 1-35, pls, 1-vill. 
2. The Fishes of the Old Red Sandstone, Part II, No. 3: the 
: Asterolepide ; by Dr. R. H. Traquair, F.R.S. pp. 119-180, 
pls. xxvli-xxxl. 
3. The Cretaceous Lamellibranchia of ‘England, -Vol. II, Part 3; 
by Henry Woods, M.A. pp. 97-182 , pls. XI—X1X. 
The Lower Paleozoic Trilobites of the Gifean District, Ayrshire, 
Part III; by F. R. Cowper Reed, M.A., F.G.S. pp. 97-186, 
with title-page, index, and pls. xiv—xx. 
5. British Cambrian Trilobites, Part I; by Philip Lake, M.A., 
F.G.S. pp. 1-28, pls. 1-1. 
6. British Graptolites, Part V; by Gertrude L. Elles, Se.D., and 
EK. M. R. Wood (Mrs. Shakespear), D.Sc. Edited by Charles 
Lapworth, [it.I F.R.S., etc. pp. lxxili-xcvi, 181-216, 
pls. xxvi-xxvil. 
ce 
fWVHIS Society has just issued its sixtieth annual volume for Detember, 
1906, which still maintains its high reputation for the excellence 
of its monographs and the accuracy and beauty of its illustrations. 
The fifty-ninth volume appeared in-November, 1905, and contained 
the fossil Cretaceous Echinodermata, by W. K. Spencer; the Cretaceous 
Lamellibranchia, by H. Woods; the Carboniferous Lamellibranchia, by 
Dr. W. Hind; the Inferior Oolite Ammonites, by 8. S. Buckman; 
and the Cornbrash Fauna, Part I, by the Rev. J. F. Blake. With 
regard to this last work, it is with deep regret we refer to the sad loss 
the Society has sustained by the death of the Rev. J. F. Blake, whose 
monograph on the Fauna of the Cornbrash_ had only been commenced 
in 1905 (see obituary, Guon. Mac. , September, 1906, pp. 426-481). 
